It is working now; but there was a time when I could not get in for days at a time, while working fine for others. If I have to guess, I will say that the DNS server of the official site is problematic.
The Lotus Cars USA website is outsourced. It has many issues. For instance, the fact that the IP address is used subsequent to the splash page instead of the domain. Growing pains, my friend. It's a minor frustration to deal with considering what they're coming from.
They seem to have an incorrect link on their home page. It appears they may be creating a new forum site or changing their DNS...and either made a mistake or are still in the process of making the changes.